Just noticed that the info box says "Made by: 3D Realms". This is incorrect, because a) Commander Keen games were developed by id Software (in fact, it was their first game) and b) it was published by Apogee Software, which is has become de facto known as 3D Realms after its most successful subsidiary (which was focused on 3D games, hence the name). However, 3D Realms was founded years after Commander Keen was first published, so stating that this game was published by 3D realms would be anachronistic.